"Our investment in WCM exemplifies our commitment to adding high-conviction, highly active investment managers to our multiaffiliate platform in order to provide our clients with a wide range of unique investment opportunities," Natixis CEO Jean Raby said in a joint news release from the two companies.

"We're really excited to enter into this partnership with Natixis," Paul Black, WCM's co-CEO, said in the release. "After a lot of thought and collective input, we concluded the smartest way to enhance our stability and to guard our investment temperament was to partner with a world-class global distribution platform."

WCM managed $29 billion as of May 31.

Natixis has 26 affiliated money managers on its investment platform that managed an aggregate $1 trillion as of March 31.